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Multifidus

Deep paraspinal muscle spanning 2-4 vertebral segments. Key segmental stabilizer of the lumbar spine. Recent studies reveal two distinct muscle bundles: one from mammillary process/lateral sacral crest, another pennate bundle from thoracolumbar fascia.

Draft95%

Anatomy

Origin: Posterior sacrum, superior iliac spine, mammillary processes of lumbar vertebrae, lateral sacral crest, thoracolumbar fascia (pennate bundle)
Insertion: Spinous processes of lumbar vertebrae, typically 2-4 levels above
Action: Segmental stabilization of the lumbar spine, extension, rotation control
Innervation: Medial branches of lumbar dorsal rami (L1-L5); each medial branch innervates only fascicles arising from the spinous process with the same segmental number
Blood Supply: Lumbar arteries (segmental branches from abdominal aorta)

Movements (8)

Movement	Joint	Role	Notes
Lumbar Extension	Lumbar Intervertebral Joints	Primary	20% of total extensor moment at L4-L5
Thoracic Rotation	Thoracic Intervertebral Joints	Secondary	Variable patterns by region; controls coupling with lateral flexion T8-T11 [Lee 2005]
Thoracic Extension	Thoracic Intervertebral Joints	Secondary	Particularly at T5 [Lee 2005]
Thoracic Lateral Flexion	Thoracic Intervertebral Joints	Secondary	Ipsilateral
Lumbar Rotation	Lumbar Intervertebral Joints	Secondary	—
Lumbar Lateral Flexion	Lumbar Intervertebral Joints	Secondary	Ipsilateral
Cervical Extension	Cervical Intervertebral Joints (C2-C7)	Stabilizer	Cervical multifidus — segmental stabilizer
Cervical Rotation	Cervical Intervertebral Joints (C2-C7)	Synergist	Contralateral rotation

Exercises (41)

Exercise	Role
Cobra Pose	Primary
Thoracic Extension/Rotation Mobilization	Primary
Cat-Cow	Primary
Schroth-Based Three-Dimensional Exercises	Primary
Bird Dog to Elbow-Knee	Primary
Core Stabilization with Abdominal Drawing-In Maneuver (ADIM)	Primary
Deep Neck Extensor Endurance	Primary
Prone Cervical Extension	Secondary
Superman	Secondary
Thoracic Spine Foam Rolling	Secondary
Seated Trunk Rotation	Secondary
Barbell Row	Stabilizer
Bent-Over Row	Stabilizer
Seated Cable Row	Stabilizer
Romanian Deadlift	Stabilizer
Russian Twist	Stabilizer
Mountain Climber	Stabilizer
Bear Crawl	Stabilizer
Tandem Stance Balance	Stabilizer
Backpack Weighted Carry	Stabilizer
Bodyweight Hip Hinge	Stabilizer
Mindfulness-Integrated Stretching	Stabilizer
Prone Hip Extension (Active, Slow Tempo)	Stabilizer
Walking Lunges with Trunk Rotation	Stabilizer
Pelvic Floor Sustained Contraction (Kegel — Endurance)	Stabilizer
The Knack (Pre-Contraction for Functional Continence)	Stabilizer
Upper Cervical Rotation Drill	Stabilizer
Bird Dog Exercise	Stabilizer
Modified Curl-Up / Dead Bug	Stabilizer
Quadruped Rockback	Stabilizer
Thoracic Rotation in Quadruped (Thread the Needle)	Stabilizer
Foam Roller Bridge	Stabilizer
Kettlebell Good Morning	Stabilizer
Single Leg Hip Hinge with Bench	Stabilizer
Back Squat (Barbell)	Stabilizer
Front Squat	Stabilizer
Goblet Squat	Stabilizer
Active Anterior Pelvic Tilt	Stabilizer
Pelvic Clock Mobilization	Stabilizer
Standing Lumbar Extension	Synergist
World's Greatest Stretch	Synergist

Sources

Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Multifidus — origin, insertion, action, innervation
Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Multifidus